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Fossils
Bonnie Branch 6th grade - Fossils
Term | Definition |
---|---|
Fossil | Remains or traces of an organism that lived long ago |
mold | imprint or hollow in rock that is shaped like and made by an organism |
cast | mold filled with hardened sediments |
amber | hardened tree sap |
coprolite | fossil dung or the stomach content of ancient animals |
gastrolith | stone used to grind food |
law of superposition | states that each undisturbed sedimentary rock layer is older than the layer above it |
relative age | age of an object compared to the age of another object |
index fossil | fossil used to help determine the relative age of rock layers |